Ephedrine, tyramine, and amphetamine belong to which class of drugs?

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Agents that inhibit cholinesterase enzymesBlockers of alpha-adrenergic receptorsSympathomimetics that act indirectlySympathomimetics that act directlyNone of the above

Explanation

Ephedrine, tyramine, and amphetamine are categorized as indirect-acting sympathomimetic drugs because they increase the release or inhibit the reuptake of endogenous catecholamines rather than directly stimulating adrenergic receptors.